2

Permanent scarring:
Dermabrasion can lead to permanent scarring of the skin if it does not heal well, gets infected or is taken too deep into the skin. The skin can also change color and become darker.
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3

It depends:
There are many types of corneal implants such as intacs, corneal transplants and other more experimental devices; most not available in the usa. Please specify type of device in a follow-up question. Have a good day!
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10

Yes:
Both of these agents prolong the qtc interval and can result in life-threatening arrhythmias. Avoid the combo unless benefits outweigh the risks.
There are other interactions as well, but this should be the one that you definitely know about.
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